Prince William took the Queen's place at an investiture ceremony on Tuesday after Her Royal Highness suffered 'mild discomfort' with her ankle.

Buckingham Palace was quick to confirm that she is not unwell and will undertake a 'busy programme of engagements' tomorrow.

It is the second investiture ceremony that the Duke of Cambridge has hosted.

His first, which took place on 17 October, saw him honour tennis star Andy Murray with an OBE. The amiable royal performed his official duties with aplomb, all the while bringing his trademark good humour to proceedings.

When he left the RAF in September William announced that he would "continue to support the work of The Queen and the Royal Family through a programme of official engagements, both at home and overseas, with The Duchess of Cambridge," and over the next 12 months would "work closely with the Royal Foundation of The Duke and Duchess of Cambridge and Prince Harry."

The second in line to the throne is "currently considering a number of options for public service, a further announcement on which will follow in due course," the statement said.

There are around 25 investiture ceremonies held annually at venues including Buckingham Palace, Windsor Castle, Holyroodhouse in Edinburgh and sometimes even abroad.